package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    //开始时间戳
    private static final long BEGIN_TIMESTAMP = 1735689600L;
    private static final int COUNT_BITS = 32;
    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String prefix) {
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowEpochSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowEpochSecond - BEGIN_TIMESTAMP;
        //生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + prefix + ":" + date);
        //拼接并且返回
        return timestamp << COUNT_BITS | count;
    }
}
